[Solved] How to identify an object in C

In the code above, x, y, and z are different objects?

Yes, they occupy completely separate regions of storage.

The members of z are the same object?

No, z.a and z.b are two distinct objects. One can say that they are sub-objects of z since the storage of each is contained in the storage of the whole, but it’s not the exact same region of storage. The size of the region also plays a part.

The elements of y are the same object?

No, each element of y is a separate object. But by the same reasoning as above, one can consider them sub-objects of y.